If you haven't done shows before, by biggest advice is to be particular in the one you choose. Don't just jump at any opportunity. Ask a lot of questions, and make sure it will be worth your time and investment. When I first started doing shows, I just kind of took any show I could get, but they just weren't worth my time, and I barely broke even for the entry fee. Craft shows can be hugely successful and bring a lot of business into your shop, but be aware of what you are getting into.